Sealing apparatus



Oct. 27, 1953 J. F. DE ANo 2,656,650

SEALING APPARATUS W M? HIS ATT NEY OC- 27 1953 J. F. DE ANo 2,656,650

4 :sxezALING APPARATUS Filed NOV. 20, 1951 2 Sheets-Sheet 2 INVENTOR:JOHN F. DE ANO hwg? HIS ATT RNEY.

Patented Oct. 27, 1953 4.mlm ne Ano, Melrose. :Para nl., assignor to The:Bauland "Corporation, 'a corporation of Illinois animation November zo,1951, se'riai 257,354 ,is claims. (c1. .t9-2) 4','lfhis"inventionrelates toisealinea'pparats 'lisefulfin lthe manufacture df electrdisliargede- :vices Vandgrnore particularlyfto appafiatn's forfseal; ingelectrodes'ystems intovthewenvelopes of belee- 4tr'pn-discharge devices.The"invent-if` l 'A c abl'e to thedlinanufajctre of wide variety :di*electron-discharge devices, Stich as conventional transmittingandreceiving-type tnbe's, brit` is particularly useful in the fabricationo'fcathode-ray tubes and will therefore be described in that connection.f n y.

A cathode-ray tube 4comprisestwo maior 'snub'- assemblies which larei.isally, `fabricated separately and j'oil'ied 4toethei' 'only in ala-terstag vvof the 'manufacturing process. Cnfe ofthfse sub'-assemblies is the outer ""ishell, or envelope, 'ofthe tiibe; the otheristh' 'electrodejsystenn or elec'- `tron The envelopevcomprisesa conepor; tion carrying aYiioriescentscreen-bearing face plate and acylindricalglajss neck portion {adapt} fed to receive the lcton :gun-`The electron gun is composed ofsvrai parts, constituting die variouselectrodes ,of the systern, which are usd- 'ally assembled and "fiX'd tov a ydise-like jgiasfs "mount designed ftdbe sealed into/,the neel;l ofthe envelope. When 'the electron 'gnnasseinbly and tube envelope areboth ,cornpvleted` thereare fused Voi' sealed together, fusally throughthe iiseoi semi-automatic vrriaohinery. .After peeling, the tubeenvelopes .aifeusoaiiy sutj'eted .to runner heattreatment toann'ealth':glassandfstrengtlien the sealing bond, following .which th y are.evacuatefd, gettered,4 and based in aceord'a'l'ewtli welll'- dustry.

l may' te, annif ted byimmdiate damage t@ te? a'sse d ofthe @litteratureat each p ing station 'inthe saiiiigandanneal- 4Diioess essential to.prevent `los"sesww "ch rnient onirwise fesuit frein news diie htokpioper namteriafititne 1ii;itt-tiesnogL cypra vinile cntoiorsiieh newsis an important een. sidratinn in the manufaetur of an types ofeicetoii-dis "ree devises, it is ef sementi import in este of animos-inftutes` ind the ententes-fof these-totes fesait spessi @sin treatmentprior 'to-final ssinti; nannies: a cathode-'ravine at th final assemnystage risnts notiiely the loss ofA a glass envelope btt the iets of aattenant ratejr in- 've'stiht due to the appeciatin in 'valueocr'clafsion'ed by application `'of .fa riiuorescent yscreen and fanlinternal 'conductive coating.

4De'terr'r'i'ination of these :highly critical `processlirligitemperatures is l'not practical through maintenanc'e :o'f`peri-nanern-,ly installed individual `tempaturemeasurin'g devices "atieach 4of the operating stations, 'since the work-holders utilized Vintransferring 'the vtubes .from 'station to station are required torotate to provide for even :heatingu/of thegl'a'ss This rotation would`create mechanical interierence between 'any stationary device andtheWork-holders. Consequently, it has been the `fiisi'ial `practice inthefart to utilize Ta contact pyronieter inserted inturn Vat teachoperating vstation vto ldetermine the `temperature Apitoduced by:theheat source atthat station. This niethod is inherently awkward inthat it Te- 'quire's the'operator properly to position the py- 'rnieterand simultaneously to `note andrecord the temperature. The method 'hasafiurther -disladvantage in that insertion of the :pyrom'eter curatetemperature determinationfhas required tf1? inbriymnt o'ftwo persons,one to position the pyrorne'tr and the othe'rtoi take readings,

`since a single operator would iind it `virtually 'nipos'sibleto "notethe position 'of `tlie vpyrometer iandrsirnultaneously to take thenecessary ,reading- It Aisa primary object of 'the `present invention toprovide a new and improved apoaratixs` for sealing'electrode `systemsinto electron-"discharge device envelopes.

It is a `more specific object 'of the invention to provide anew andimproved device for the aen'rate determination of heat-treatingtemperatures `at thevarious `operating 'stations in apparatjds forsealing electrode systems :in `electron-discharge device envelopes.

It is 'a farther vobject of the invention to provide apparatus capableof achieving `this accuracy ofl temperature determination withiit thenecessity 'of incorporating elaborate and` expensiveidevices or amultiplicity of devices andrwhich will require a minimum of time andskill on the part of the process operator.

-Tlie invention accordingly provides vapparatus for sealing electrodesystems in electron-.discharge device envelopes', which apparatus .in-

cludes a. plurality of operating stations, each having at least one`localized heat source, `arranged in predetermined sequence forsubjecting the envelopes to a predetermined heat-treatin'geycle.

3 The apparatus also includes a plurality of spaced rotatablework-holders, relatively movable with respect to the operating stations,for transferring the envelopes and electrode systems to each of theoperating stations in sequence. A driving apparatus is provided toeffect rotation of the workholders. A support member, generallysimulating one of the envelopes in physical configuration, is removablyinstalled in one of the work-holders, and a temperature-indicatingdevice is mounted on this supp-ort member. A thermally sensitive deviceis operatively connected to the temperature-indicating device and fixedto the support mem-ber in such a position that it registers the heattreating temperature at the particular operating station momentarilyoccupied by the work-holder in which the support member .is currentlyinstalled. Friction coupling means is provided between the drivingapparatus and the support member to permit arrestment of the rotation ofthe support member independently of rotation vof the remainder of thework-holders.

The features of the present invention which are believed to be novel areset forth with particularity in the appended claims but its organizationand manner of operati-on, together with further objects and advantagesthereof, may best be understood by reference to the followingdescription taken in connection with the accompanying drawlings, in theseveral figures of which like elements are indicated by likereferencenumerals, and in which:

Figure 1 is a view, partly schematic, of a portion of a sealing machineconstructed in accord- Iance with the invention, showing two operating.stations at one of which a cathode-ray tube is Ibeing processed and atthe other of which a teinlperature determination is being made, and

Figure 2 is a sectional View oi the temperaturemeasuring portion of theapparatus of Figure The sealing machinery of the present invention mayconsist of a number of operating stations each comprising a localizedheat source. The

Aheat sources are preadjusted to suitable operating vtemperatures inaccordance with a predetermined heat-treating cycle. AV plurality ofwork-holders .are used to support a tube envelope and an electron gunmount assembly in suitable juxtaposi- -tion at each of the operatingstations and are the work-holders on a rotatable circular turn-A tablewithin the circle formed by the operating v stations..

In Figure 1, only two operating stations lil and II of such an apparatusare shown, it being understood that a sufficient number of additionalsimilar operating stations, not shown, are also provided to perform theseveral steps of the sealing and annealing process. Two work-holders I2and I3 are shown at operating stations lil and i l, respectively, andare mounted on a turntable I4 which is arranged to transfer work-holdersI2 and I3 from operating station to operating station as by means of amotor drive system (not shown) or in any other suitable manner.Workholders I2 and I3 are arranged for continuous rotation, as indicatedby arrows I5 and I6, by means of a linkage Il', such as a chain drive, abelt drive, or other similar power transfer means, actuated by a powersource I8, which may be an electrical .motor or any other suitablesource of mechanical power. Power source I8 and linkage Il constitutethe driving apparatus for rotating work-holders I2 and I3 and theremainder of the work-holders (not shown). A pair of gas jets I9, orother localized heat source, are provided at operating station I0 andare connected to a source (not shown) of suitable gaseous combustiblematerial in any known fashion. Similar heat sources are provided at eachof the operating stations.

Work-holder I2, in position at operating station I0, comprises a base 22which is rotatably mounted on turntable I4. Rotatable base 22 isprovided with suitable connection means such as a sprocket 28 tocomplete a mechanical coupling to linkage I'I and thus effecttransmission of the `power necessary for rotation. An intermediate ring23 is supported by a pair oi rods 24 mounted on base 22, anda clamp base25 is adjustably suspended from ring 23 in a position somewhat abovelocalized heat source I9. A clamp 26 is mounted in the center of clampbase 25, the central opening formed by the two sides of clamp 26 beinggenerally circular in shape. An envelope support ring 27 is adjustablymounted on intermediate ring 23.

A cathode-ray tube envelope 28 is inserted in work-holder I2, the upperor cone portion 29 of the tube envelope resting on envelope support ring21 and the lower or neck portion 32 of the cathode-ray tube 28 beingengaged by clamp 26. Since the dimensions of cone portion 29 and neckportion 32 of cathode-ray tube 28 may vary with the particular size ofthe tube being processed, the exact positioning of envelope support ring2 and clamp base 25 with respect to intermediate ring 23 may requireadjustment in order to bring neck portion 32 into proper juxtapositionwith localized heat source I9. This adjustment has been provided for bythe adjustable mounting of these members with respect to intermediatering 23 through the medium of several threaded adjustment rods 33.

A vertically movable plunger 34 is mounted on base 22 and is rotatabletherewith. Plunger 34 serves as a support for an electron gun mountassembly comprising an electrode system'36 shown schematically in thedrawing, and a glass mount 31. The vertical position of plunger 34 isregulated to locate glass mount 31 in suitable juxtaposition withlocalized heat source I9.

Work-holder I3 at operating station II is constructed in the same manneras work-holder I2 at operating station I0. However, work-holder I3supports a temperature-determining device 38 instead of the cathode-raytube envelope supported in work-holder I2. Temperature-determiningdevice 38 comprises a support member generally simulating a cathode-raytube envelope in physical configuration. A cone portion 4I 'oftemperature-determining device 38 is retained by the work-holder I3 in amanner similar to that in which cone portion 29 of cathode-ray tube 28is held in work-holder I2, and a neck portion 42 oftemperature-determining device 38 is clamped in work-holder I3 inprecisely the same manner as that employed in clamping neck portion 32of cathode-ray tube 28 in work-holder I2. A thermocouple 43 or otherthermally sensitive device is fixed to neck portion 42 in a suitableposition to register the heat-treating temperature at each operatingstation in sequence .as turntable I4 is rotated to transport workliolderI3 from station to station. A temperature-indicating device 44,operatively connected to thermocouple 43, isl mounted on the peripheryof cone Pportion 4I in afmanner tofbe lmore fully described inconnection with Figure -2.

Hfn `carr'y'nig out the sealing process, -cathoderay A'tube envelope 2;8is mounted'in the workholder as indicated, vthe position of envelopesupportring 21 and clamp base 25 being so adjusted as 4to place Yneckportion 32 of envelope 28-in -position -to fbe heated Aby the flamesfrom gas jets I8. Electron gun mountassembly 38,31 isplaced Aonvertically adjustable Aplunger 34 and plunger `v34 `is adjusted-to-place glass Vmount 31 rin such position thatit is also heated `bythe flames from ==hea-t source I8. If it is assumed that operatingstation I0 -is the initial :stage of the process, the temperature ofneck portion 32 andfglass mount 31 is--increased over room temperatureby a pre- `-cietermined amount while the work-holder occupies thisparticular operation station. After `apredeterrnined time during Awhichthe tem-pera-tureof these parts is increased to the maximum i andglass-mount 311 -is increased until work-holder Il.,

`I2 Vreaches an operating station `which main-- `tains a temperaturesuiiciently high to permit fusion of glass neck portion 3'2 and glassmount 31. At this opera-ting station, a further short movement ofplunger 34 raises glass mount 31 -until its periphery :is in contactwith the inner vsur-face of neck 32. At this operating station,therefore, mount 31 and neck 32 are fused together-and the electron gunmount assembly is etectively sealed into the envelope. Further operatingstations in the complete process provide a graduated lowering Yoi" thetemperature of thenow-fused mount 31 and neck portion 32 and fi'urtherserve to anneal and, strengthen the newly -formed bond `between thesetwo members.

-The progress of work-holder I3 through the `sealing and annealingstages is performed in exactly `the same manner and sequence as thatIol- 'lowed by work-holder I2. When the work-.holder occupies operatingstation II, the position or" -thermooouple 43 makes it possible todetermine the exacttemperature to which next portion 32 `and glassmount31 `willbe subjected when they reach operating station II. Thisdetermination `of the heat treating temperature at operating station `IIis effected by noting and reading temperature-indicating device 44,since this device `is`-operatively connected with thermocouple 43.

.As work-holder I3, and therefore temperature- 4determining device 38,proceeds in sequence 'through the operating stations of the sealing and`annealing apparatus, a series of Vtemperature readings are made Yandgas jets I8 are adjusted until the temperature readings conform with thendesired temperatures of the heat-treating cycle, Thus, an exact recordof the temperature at each of the operating stations in their propersequence is obtained and precise adjustment of `each heat source iseffected.

Figure 2 is a sectional detail view of temperature-determining device38. As previously indicated, a temperature-indicating device 44 isvmounted on the periphery of coneportion4l and -thermocouple 43 is`ilxed to neck portion 42 of device 38. A pair of flexible connectorleads 45 provide fanioperattve wconnection between :thenmocouple 43 .andtemperature-indicating 44 so that device 44 `registers the operatingmmperature at the position `occupied :by thermo,- couple 43. `Neckportion '42 `is slidahly supported within an vextension 18 of xconeaportionM, :and a thumb :screw 4I6 L-is provided extension 4.8 forvfixing neck portion '42 to cone portion r4I While permitting Averticaladjustment o! thermol couple 43. A plurality of outwardly extendingflanges .41, or alternatively a single peripheral loutwardly extendingange, :are axed `to .cone portion 4.1, and a frame ,member 48 4isretained A-in peripherally encompassing :relation `:with portion l41| byflanges 41. A 'plurality of `:rotary bearings .49 are mounted onframexmember v48,-t0 .engage cone portion A4I ,and provide couplingbetween cone portion 4I and trame member ,48 .whendevice 38 is installedinane of the work-holders. Frame member 48 -Js so formed as to fit onenvelope support ring :21 and supports cone portion 4I through thefrictional `couplingcf bearing 4.9. Another .rotary bearing 52 ismounted with an inner race 53 in engagement with neck portion 42 andprovides means for frictional coupling between neck pont-ion 42 and .thework-holder through `an outer race 54 of` bearing 52 which is engaged byclamp 28 (Figure '1) AS previously mentioned, the physical confgrationof the tube envelopes .being processedmaiY vary to a considerableextent, and it is therefore desirable to provide means forjanalogous`variation in the configuration oftemperature-determining device 38.Insofarasthe sealngapparatus is concerned, `,the only physical variationof importance is :the extension ofzneck .Dortn 421m relation to coneportion AI. Variation inthe length .of this extension is possiblethrough adjustment oi the position of neck portion 42 with relation tocone portion 4 I, which` may be effected through use of thumb screw 46.Thus theposition of thermocouple 43 in relation to the localized heatsource at the operating station currently occupied by Work-holder I3:maybe regulated exactly to `insure correct registration of theheat-.treating temperature. i

As shown in Figure l, temperature-determining device 38, when installed`in workholder I3, rotates with the work-holder. `For convenience inreading temperature-indicating device 44,.,it1s desirable to provide forarrestment ofthe rotation of cone portion 4I and neck portion42` withoutimpedng the rotation of work-holder I3. Rotary bearings 49 and 5,2provide fricticnalncou- `pling between work-holder I3 and device 38 `andpermit the operator to arrest device 38 independ-l ently of rotation ofYwork-holder I3 by simply grasping temperature-indicating device 44.This provision for arrestment of temperature-deter- `mining device 38independently of rotation of work-holder I3 is useful when a chaindrive'is employed since, in that event, it is not possible to arrestrotation ofwork-holder-I3 without iamming linkage I1 and thereforesimultaneously arresting all other work-holders in the apparatus. Whenconnecting means 28 and-linkage `lfI provide for frictional coupling asis the case-When a belt drive is employed, it is possible to arrest therotary motion `of work-holder I3-without affecting the rotation of theother work-holders in the system. In such a case there is nonecessityfor providing frictional coupling between work-holder I3 andtemperature-determining device 38, and ange 4l, frame member' 48, and`bearings 49 and 52 are not required.

In practice, the exact temperature gradations of the requiredheat-treating cycle are determined by calculation or from experience,and the localized heat sources, such as heat source I9. are adjusted toapproximate the desired temperature at each Yof the operating stationsl,l l, etc. of .the sealing apparatus. Temperaturedetermining device 38 isthen installed in one of the work-holders and proceeds through theheat-treating cycle, registering the temperature 4developed at each ofthe operating stations. Dev1- ations from'the required temperatures arenoted and fine adjustments are made until a complete testV run withdevice 38 indicates accurate presetting of the heat-treatingtemperatures at all operating stations. Device 38 may then be removedfrom the work-holder, if the operator so desires, and the sealingapparatus may be utilized for sealing electron gun mount assemblies intocathode-ray tube envelopes Without encountering excessive breakage dueto uncontrolled heat stresses.

Experience has indicated that once the proper heat-treating temperatureshave been accurately established, the sealing operation may be continuedfor several hours Without signicant diniculty. However, since thelocalized heat sources 'are' adjustable and are somewhat subject to`uncalculated variation, it is possible that they ving heat-treatingtemperatures at the individual operating stations.

The arrangement and coniiguration of the improved apparatus for sealingelectron guns into cathode-ray tube envelopes as described enables theoperator to maintain an accurate check on the exact heat-treatingtemperature at each operating station at the precise position desired.It

is not necessary that the operator exercise particular skill or judgmentin the positioning of a thermally sensitive device such as a contactpyrometer; he is therefore free to concentrate on properly observing andrecording the temperature itself. The invention permits accuratedetermination of the critical temperatures of the sealing process intheir predetermined sequence without requiring elaborate and complexindividual installations at each operating station. It fur- `therpermits determination of those temperatures While requiring onlyintermittent attendance by a single operator. Use of the invention haseffected a substantial reduction in the num- ;ber of ilaWs produced inoperation of the process andhas led to a consequent marked reduction inthe losses therefrom.

While a particular embodiment of the present invention has been shownand described, it will be obvious to those skilled in the art thatchanges and modifications may be made without departing from theinvention in its broader aspects, and, therefore, the aim in theappended claims isto coverall such changes and modications as fallWithin the true spirit and scope Iclaim: Y 1. Apparatus for sealingelectrode systems into electron-discharge device envelopes including: a

plurality of operating stations, each having at least one localized heatsource, arranged in predetermined sequence for subjecting said envelopesto a predetermined heat-treating cycle; a

plurality of spaced rotatable Work-holders relatively movable Withrespect to said operating stations for transferring said envelopes andsaid electrode systems to each of said operating stations in sequence;driving apparatus for rotating said work-holders; a support member,generally simulating one of said envelopes in physical conguration,removably installed in one of said of the invention.

, work-holders; a temperature-indicating device mounted on said supportmember; a thermally sensitive device operatively connected to saidtemperature-indicating device and fixed to said support member in aposition to register the heat treating temperature at the particularoperating station momentarily occupied by said one rotatablework-holder; and friction coupling means between said driving apparatusand said support member to permit arrestment of rotation of said supportmember independently of rotation of the remainder of said work-holders.

2. Apparatus for sealing electrode systems into electron-dischargedevice envelopes including: a plurality of operating stations, eachhaving at least one localized heat source, arranged in predeterminedsequence for subjecting said envelopes to a predetermined heat-treatingcycle; a plurality of spaced rotatable Work-holders relatively movablewith respect to said operating stations for transferring said envelopesand said electrode systems to each of said operating stations insequence; driving apparatus for rotating said Work-holders; a supportmember, generally simulating one of said envelopes in physicalconiiguration, removably installed in one of said work-holders; atemperature-indicating device mounted on said support member; athermally sensitive device operatively connected to saidtemperature-indicating device and fixed to said support member in aposition to register the heat treating temperature at the particularoperating station momentarily occupied by said one rotatablework-holder; and friction coupling means between said work-holder andsaid support member to permit arrestment of rotation of said supportmember independently of rotation of said work-holder.

3. Apparatus for sealing electron gun mounts into cathode-ray tubeenvelopes including: a plurality of operating stations, each having atleast one localized heat source, arranged in predetermined sequence forsubjecting said envelopes to a predetermined heat-treating cycle; aplurality of spaced'rotatable work-holders relatively movable withrespect to said operating stations for transferring said envelopes andsaid electron gun mounts to each of said operating stations in sequence;driving apparatus for rotating said Workholders; a support member,generally simulating a cathode-ray tube envelope in physicalconguration, removably installed in one of said workholders; atemperature indicating device mounted on said support member; athermally sensitive device operatively connected to saidtemperature-indicating device and iixed to said support member in aposition to register the heat treating temperature at the particularoperating station momentarily occupied by said one rotatablework-holder; and means, including at least one friction coupling device,for coupling said driving apparatus to said one work-holder and forcoupling said one work-holder to said support member to permitarrestment of rotation of said support member independently of rotationof the remainder of said work-holders.

4. Apparatus for sealing electrode systems into electron-dischargedevice envelopes including: a plurality of operating stations, eachhaving at least one localized heat source, arranged in predeterminedsequence for subjecting said envelopes to a predetermined heat-treatingcycle; a plurality of spaced rotatable work-holders relatively movablewith respect to said operating stations for transferring said envelopesand said electrode systems to each of said operating stations insequence; driving apparatus for rotating said work-holders; a supportmemberl generally simulating one of said envelopes in physicalconfiguration, removably installed in one of said work-holders; atemperature-indicating device mounted on said support member; athermally sensitive device operatively connected to saidtemperature-indicating device and fixed to said support member in aposition to register the heat treating temperature at the particularoperating station momentarily occupied by said one rotatableWork-holder; a peripheral frame member adapted to be supported in saidWork-holder and frictionally coupled to said support member andproviding support therefor; and a rotary bearing having an inner race inengagement with said support member and an outer race engaged by saidWork-holder, whereby rotation of said support member may be arrestedindependently of rotation of said work-holder.

5. Apparatus for sealing electrode systems into electron-dischargedevice envelopes including: a plurality of operating stations, eachhaving at least one localized heat source, arranged in predeterminedsequence for subjecting said envelopes to a predetermined heat-treatingcycle; a plurality of spaced rotatable work-holders relatively movablewith respect to said operating stations for transferring said envelopesand said electrode systems to each of said operating stations insequence; driving apparatus for rotating said work-holders; a supportmember, generally simulating one of said envelopes in physicalconfiguration, removably installed in one of said work-holders; atemperature-indicating device mounted on said support member; athermally sensitive device operatively connected to saidtemperature-indicating device and fixed to said support member in aposition to register the heat treating temperature at the particularoperating station momentarily occupied by said one rotatablework-holder; an outwardly extending nange fixed to said support member;a frame member retained by said flange; a rst rotary bearing supportedby said frame member in engagement with said support member when saidsupport member is installed in said work-holder; and another rotarybearing having an inner race in engagement with said Work-holder,whereby rotation of said support member may be arrested independently ofrotation of said workholder.

6. In apparatus for sealing electrode systems into electron-dischargedevice envelopes, of the type comprising a plurality of rotatableworkholders in juxtaposition with respective localized heat sources: asupport member generally simulating one of said envelopes in physicalconfiguration; a temperature-indicating device mounted on said supportmember; a thermocouple operatively connected to saidtemperature-indicating device and adiustably fixed to said supportmember in a position to register the heat-treating temperature of saidlocalized heat source when said support member is installed in one ofsaid work-holders; and friction coupling means between said work-holderand said support member to permit arrestment of rotation of said supportmember independently of rotation of the remainder of said work-holders.

7. In apparatus for sealing electrode systems into electron-dischargedevice envelopes, of the type comprising at least one rotatableworkholder in juxtaposition with at least one localized heat source: asupport member generally simulating one of said envelopes in physicalconfiguration; a temperature-indicating device mounted on said supportmember; a thermally sensitive device operatively connected to saidtemperatureindicating device and fixed to said support member in aposition to register the heat-treating temperature of said localizedheat source when said support member is installed in said workholder; aperipheral frame member adapted to be supported in said Work-holder andfrictionally coupled to said support member and providing supporttherefor; and a rotary bearing having an inner race in engagement withsaid support member and an outer race engaged by said workholder,whereby rotation of said support member may be arrested independently ofrotation of said work-holder.

8. In apparatus for sealing electron gun mounts into cathode-ray tubeenvelopes, of the type comprising at least one rotatable work-holder injuxtaposition with at least one localized heat source: a support membercomprising a cone portion and a neck portion and generally simulating acathode-ray tube envelope, said neck portion being axially adjustablewith respect to said cone portion; a temperature-indicating devicemounted on said support member a thermocouple operatively connected tosaid temperature-indicating device and xed to said neck portion in aposition to register the heat-treating temperature of said localizedheat source when said support member is installed in said work-holder;an outwardly extending flange affixed to said cone portion; a framemember retained by said flange; a first rotary bearing supported by saidframe member in engagement with said cone portion when said supportmember is installed in said work-holder; and another rotary bearinghaving an inner race in engagement with said neck portion and an outerrace engaged by said workholder, whereby rotation of said support membermay be arrested independently of rotation of said work-holder.

JOHN F. DE ANO.

References Cited in the file of this patent UNITED STATES PATENTS MalloyJan. 20, 1948

